The Web Install ActiveX control (CSDWebInstaller) in Cisco Secure Desktop (CSD) before 3.5.841 does not properly verify the signatures of downloaded programs, which allows remote attackers to force the download and execution of arbitrary files via a crafted web page, aka Bug ID CSCta25876.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.